N-propyl diaminodiphenylsulfone and process for obtaining same



Patented Nov. 30, 1948 AND PROCESS FOR OBTAINING SAME Alber't L. Rawlins, Grosse Pointe Woods,-Mich-.,

assignor to Parke, Davis & Company, Detroit,

Mich, a corporation of Michigan No Drawing. Application March 29, 1943, a I Serial No. 481,007 a salads; (c1. 2e0-..-397.e)f

' The invention has to do with new aryl amines of the diamino diphenyl sulfone type. It relates more particularly to p,p'-diamino diphenyl sulfones having a free para amino group attached to one of the phenyl nuclei and a secondary para amino group attached to the other; phenyl nucleus.

The new compounds have the general formula where R1 is alkyl having more than two carbon atoms.

The new compounds are valuable therapeutic agents and intermediates for therapeutic agents. They are generally effective against diseases and infections caused by micro-organisms such as streptococci, staphylococci, pneumococci and mycobacterium tuberculosis. Many of them are effective as antiseptics upon. oral administration. They are of low toxicity and are very stable chemically.

A preferred group of compounds of the invention is that of the above general formula, where R1 is a lower straight or branched chain alkyl radical containing not more than six carbon atoms. Compounds of this preferred type, such as p-amino-p'-n-propylamino diphenyl sulfone, are especially valuable for treatment of patients affected by tuberculosis.

The compounds of the invention can be made by starting with p,p'-diamino diphenyl sulfone and alkylating one of the two amino groups of this sulfone, using an alkyl halide or suitably substituted alkyl halide. The alkylation can be partial, whereby secondary amines are obtained. This transformation can be illustrated as follows:

Instead of starting with p,p'-diamino diphenyl sulfone, one can use a para-halogen-p-monoamino diphenyl sulfone and react it with a primary alkyl amine to replace the halogen of the sulfone by an alkyl amino group.

The invention can be illustrated by the following examples:

Emample 1. p-Amino-p' n-propylamino diphenyl sulfone ENG-SOzQ-BFCECH on;

' 41 grams of diaminodiphenyl sulfone, grams of n-propyl bromide, cc. oiiwater and 82 cc. of alcohol are mixed and refluxed for '24 hours. I The crystals which form on cooling are filtered off, dis olved in ab olute alcohol and the alcoholic solution decolorize'd by treatment with charcoal. The product is crystallized out of the absolute alcohol solution, separated and dried. =It consists of white crystals of -pan1inop-n-propylamino"diphenyl sulfonewhich melt at 201-203 C. Analysis gives, nitrogen found, 9.82%, nitrogen. calculated, 9.65%.

The product of this example is an effective antiseptic against Myco. tuberculosis and like microorganisms.

Instead of using n-propyl bromide in this example, ethyl bromide or methyl bromide can be used, with suitable variation of the procedure such as use of a pressure reaction vessel. With these reactants the products are, respectively, p-amino-p'-ethylamino diphenyl sulfone and p-amino-p'-methylamino diphenyl sulfone.

Example 2.p-Amz'no-p'-n-amylamino diphenyl sulfone 90 grams of 4,4-diamino diphenyl sulfone, 200 grams of n-amyl bromide, 200 cc. of alcohol and 400 cc. of water are mixed and refluxed for 26 hours. The mixture is diluted with an equal volume of water and neutralized with concentrated NaOH solution. The crystals formed are filtered off and crystallized from alcohol, benzene and, finally, from a 50-50 mixture of water and alcohol containing 2% hydrochloric acid. The pearlywhite crystals formed melt at 116418 and are shown to be the monoamyl derivative by analysis. Analysis gives, nitrogen found, 8.80%, nitrogen calculated, 8.85%.

Emample 3.p-Amino-p'-dodecylamino diphenyl sulfone 200 grams of 4,4'-diamino diphenyl sulfone, 290 grams of dodecyl iodide, 800 cc. of alcohol and 200 cc. of water are refluxed for 15 hours. The

crystals which form on cooling are recrystallized from alcohol and then acetone. 50 grams of white pearly-like crystals melting at 172-173 C. are obtained. Analyses show it to be the monododecyl derivative.

Example 4.-p4-Amih0-p'-octadecylamino diphenyl suljone 185 grams of 4,4'-diamino dlphenyl sulfone,"3(l0 grams of n-oct-adecyl iodideand QOO ccmfPaicohQl are mixed together and themiitture'rfiuxed for 22 hours. The mixture is then cooled "and 'the crystals which form are filteredtoff. lThetproduct is thereafter crystallized from acetone and 'ath'en from benzene and filtered ofi and washed with ether. 35 grams of white, pearly-like "crystals are obtained melting at 166468. Analyses show ltto be the 'mono-oetat'le-czvl derivative.

The above examples are-merely illustrative of the means by which the new compositions of this inventiommay .be olotai-nevzl. When used in the clinic, the dosages orally and by injection are :oomparable to those used with cother known dizphenyl sulforie rcompounds. For .insta'nce, .the m-propylamino productoi\Example *2.can 'be given qoraily tozhuman .subjectsiintclosages of 1L8 gram :to 112: grams per day.

-What :I claimtas;my lmventionl is 1. :Azcompound ofthelfermula.

nmQ-soOrm-n K101150311 2. Process for obtaining p-amino-p'-n-propylamino dlphenyl sulfone which comprises reacting, p,p'-diamino diphenyl sulfone with an xcess of n-propyl halide.

3. Process for obtaining p-amino-p-n-propylamino diphenyksulfonewhich comprises reacting p,p'-diamino diphenyl sulfone with an excess of n-propyl bromide.

ALBERT L. RAWLINS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date $224,156 Kharasch Dec. 10, 1940 2,254,872 Kharasch Sept. 2, 1941 2;328,5'48 Dohrn et al Sept. 7, 1943 2,333,552 Pohls et "a1. Nov. 2, 1943 22382324 Tschesche Aug. 14, 1945 FOREIGN PATENTS Number Country Date 490,364 GreatBritain -Aug.9, 1938 44,220 France July 20, 1939 ()THER REFERENCES Feldman et al., Proc. Stafi Meetings of Mayo Clinic, vol. 20;May30, 1945, ppx161 to 165, 

